Made DrawOperation non-disposable

core/src/io/anuke/mindustry/editor/DrawOperation.java

@@ -1,13 +1,12 @@
 package io.anuke.mindustry.editor;
 
 import com.badlogic.gdx.utils.Array;
-import com.badlogic.gdx.utils.Disposable;
 import com.badlogic.gdx.utils.IntSet;
 import io.anuke.mindustry.io.MapTileData;
 import io.anuke.mindustry.io.MapTileData.TileDataMarker;
 import io.anuke.ucore.util.Bits;
 
-public class DrawOperation implements Disposable{
+public class DrawOperation{
 	/**Data to apply operation to.*/
 	private MapTileData data;
 	/**List of per-tile operations that occurred.*/
@@ -50,9 +49,6 @@ public class DrawOperation implements Disposable{
 		}
 	}
 
-	@Override
-	public void dispose() {}
-
 	public static class TileOperation{
 		public short x, y;
 		public TileDataMarker from;

core/src/io/anuke/mindustry/editor/OperationStack.java

@@ -12,9 +12,6 @@ public class OperationStack{
 	}
 	
 	public void clear(){
-		for(DrawOperation op : stack){
-			op.dispose();
-		}
 		stack.clear();
 		index = 0;
 	}